TY - JOUR
T1 - Structure and properties of polymethylsilsesquioxane aerogels synthesized with surfactant n-hexadecyltrimethylammonium chloride
AU - Hayase, Gen
AU - Kanamori, Kazuyoshi
AU - Nakanishi, Kazuki
N1 - Funding Information:
The present work was supported by Advanced Low Carbon Technology Research and Development Program (ALCA) from Japan Science and Technology Agency (JST). Also acknowledged is the Global COE Program ‘‘International Center for Integrated Research and Advanced Education in Materials Science” (No. B-09) of the MEXT, Japan, administrated by the Japan Society for the Promotion of Science (JSPS).
PY - 2012/8/1
Y1 - 2012/8/1
N2 - Structure and physical properties of monolithic polymethylsilsesquioxane (PMSQ, CH 3SiO 1.5) aerogels have been systematically examined with varied starting compositions using a sol-gel system containing surfactant n-hexadecyltrimethylammonium chloride (CTAC). The precursor methyltrimethoxysilane (MTMS) undergoes hydrolysis and polycondensation under an acid-base two-step reaction to obtain uniform gels as a one-pot reaction. To compare the samples, each factor of starting composition, such as amount of CTAC, concentration of aqueous acetic acid solution, volume of solvent and amount of urea, is independently varied. With appropriate concentrations of surfactant CTAC, the aerogels with high light transmittance (at 550 nm) are obtained, owing to the effective suppression of macroscopic phase separation. Acid-base catalysts, acetic acid and urea also impose significant effects on the properties of obtained aerogels including their molecular-level structures. The aerogel with 91% of light transmittance was obtained under an optimized condition. The lowest density of the PMSQ aerogel in this system reaches 0.045 g cm -3.
AB - Structure and physical properties of monolithic polymethylsilsesquioxane (PMSQ, CH 3SiO 1.5) aerogels have been systematically examined with varied starting compositions using a sol-gel system containing surfactant n-hexadecyltrimethylammonium chloride (CTAC). The precursor methyltrimethoxysilane (MTMS) undergoes hydrolysis and polycondensation under an acid-base two-step reaction to obtain uniform gels as a one-pot reaction. To compare the samples, each factor of starting composition, such as amount of CTAC, concentration of aqueous acetic acid solution, volume of solvent and amount of urea, is independently varied. With appropriate concentrations of surfactant CTAC, the aerogels with high light transmittance (at 550 nm) are obtained, owing to the effective suppression of macroscopic phase separation. Acid-base catalysts, acetic acid and urea also impose significant effects on the properties of obtained aerogels including their molecular-level structures. The aerogel with 91% of light transmittance was obtained under an optimized condition. The lowest density of the PMSQ aerogel in this system reaches 0.045 g cm -3.
KW - Aerogels
KW - Organic-inorganic hybrid
KW - Polymethylsilsesquioxane
KW - Sol-gel
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U2 - 10.1016/j.micromeso.2012.03.049
DO - 10.1016/j.micromeso.2012.03.049
M3 - Article
AN - SCOPUS:84859933015
SN - 1387-1811
VL - 158
SP - 247
EP - 252
JO - Zeolites
JF - Zeolites
ER -